The fifth release candidate for NetBSD 4.0 has been released. "We hope that this release candidate to be the last one before the final release of NetBSD 4.0. Please help us to test it as much as possible to make NetBSD 4.0 a solid release."

as for Flash ->
works both for linux firefox/mozilla/seamonkey/opera and for native firefox/mozilla/seamonkey through nsplugginwrapper. For Konqueror ufortunately not (gnash also "works" for native firefox/seamonkey)

as for Java ->

or you use linux firefox/mozilla/seamonkey/opera with linux Java or you use native firefox/mozilla/seamonkey/konqueror with native Java (firstly compile Java).